Gas and air mixer for gas-burners.



W. C. BUELL, JR.

GAS AND AIR MIXER FOR GAS BURNERS. APPLICATfoN HLED MAR. 29. 1916.

,289,383 Patented Dec. 31, 1918.

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WILLIAM C.BUELL, JR., OF SEWICKLEY, PENNSYLVANIA, ASSIGN OR TO TATE, JONES &

COMPANY, INC., OF PITTSBURGH. PENN VANI.

SYLVANIA, -A CORPORATION OF PENNSYL- GAS AND AIR MIXER FOR GAS-BURNERS.

Specification of Letters Patent.

Patented )ec.`31. 1918.

Application led March 29, 1916. Serial No. 87,626.

To all whom t may concern.'

Beit known that I, WILLIAM C. BUELL, Jr., a citizen of the Unit-ed States, residing at Sewickley, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Gas and Air Mixers for Gas-Burners, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specilication, in whichz- Figure l is a sectional view of one form of gas burner embodying my invention.

Figs. 2, 3 and 4 are detail sectional'views showing diferent forms of injector nozzles which may be employed.

My invention'has relation to gas and air mixers for gas burners for the combustion of gaseous fuels, such as natural, coal, coke oven, Water, producer, acetylene, hydrogen and other gases containing carbon, hydrocarbon or hydrogen and with which it is necessary to supply oxygen for the combustion, either in the form of air or as oxygen gas.

In the operation of such burners it is the common practice to have the gas and its combustive agent pass through a mixing device at varying pressures. Usually the combustive agent is at a higher pressure than the gas, excepting in the case of producer gas which is usually introduced at the higher pressure.

In ordinary practice the mixture of the gases is controlled by two valves, one operating on the gas line and the other on the combustive agent or air line. Such adjustment as may be'necessary to secure combustion is a matter of manual operation and the completeness or perfection of the combustion depends entirely upon the experience or ability of the operator in the manipulation of these valves. Experience shows that in the majority of cases the gas and air are not introduced in the proper proportions,

for perfect combustion and there is a very considerable loss in the heating value of the In these drawings, thenumeral 2 .desig-v nates a casing having therein a mixing chamber 3. 4 isa connectlon leading to the supply line for air or other combustive agent, and which, terminates inthe injector nozzle 5. 6 is a nipple connecting the casing 2 with the burner connection 7 and the passage through Which is of a somewhat restricted or throat form. The nozzle 5 may be of the conical form shown in Fig. l, or it may be of any other suitable form.

In Fig. 2 I have shown the nozzle 51 as having a restricted delivery orifice 5.

4In Fig. 3, I have shown another form similar to that shown in Fig. l except that the inner end of the cone is `partially closed, but is provided with a central delivery orifice 5c. y

Fig. 4 shows still another form in which the delivery is through the small pipe 5d. As above stated, this nozzle may be of any usual or suitable form for increasing the velocity of the air, or which will increase the velocit and govern the ultimate quantity, or Whic will govern the ultimate quantity without` multiple orifice type and may be of any of the conventional types used in the burning of agaseous fuel where a combustive mixture is produced before the burner orifices are reached.

The chamber 3 hasan extension 8 at one side for connection with a as supply pipe or .conduit 9. The outlet rom the supply pipe or conduit 9 is controlled by'a valve 10.

This valve is preferably in the form of a 15. If such governor is direction to the pull exerted thereon by the .l vacuum produced in the chamber 3;. and 1sJ preferably Sol adjusted that the tension which it exerts lis slightly more thanisuflicient tov overcome the gas pressure in the pipe or con-j l;duit 9, If noair is-p'assing through the 'nvjector, the valve therefor remains closed; but ,as soon as air-is 'passed through the injector and a vacuum is thereby created in the chamber 3, the valve. is moved inward away "20 'from its Seat, thereby admitting suicient'gas he 'to' produce a combustible mixture.

greater the.. degree of vacuum producedin:

the chamber 3, the greater isthe lopening lmovement of the diaphragm valve. The tenl ,25 sion "of the spring 11 may be readilyadjusteV or conduit y,9'may or with a gas governor at used, ,it may be of ed.- e The supply pi may not be provide any well known type operating valve.

In* using the burner with a gas, such as producer gas, which kis under a higher pressure than that of the combustive agent, vthe supply connections are reversed, the gas entering the chamber 3 through the connection and the combustive agent entering such chamber from the'con'duit 9 and controlled by the valve 10.4 In such use,vthe

' yoperation is `generally the .Same as that dc-i Y f -combustive agent to to hold a 'given pressure between the governor and thel scribed, but the vacuum action is producedl by the gas, and the air supply is automati-'j cally controlled .in accordance with the changes'in' such vacuum action. l

`The valve may be arranged in various otherways than that shown and any suitable means may .be provided for normally holding it'to its seat and for properly guiding its movements. The general construction of the 4 burner parts may also be widely varied,

the admission'. of the lgas to be mixed with a ture is .automatically controlled, the gas adl mission being in proportion to -the vacuum so' v 'My invention-provides a burner in which form a combustiblevrnix-4 created by 'theair supplied to the burner andv 'varying with the air pressure. j

I claim:

Av mixing device for gas burners, for auto-v matigcally mixing air and'ngas in definite/pro-- portions, comprismga mixing .chamber'having anv alr inlet, a gas inlet, andl an outlet y leading to 'a burner, one of said inlets termilation tothe other inlet, a valve controlling the last-named inlet and opening 1n the di# contracted nozzle in injector rerectionof the mixing chamber, underthein -jector action of Said nozzle, and a loading -devicearranged to exert an increasing closing load on said valve a'sthe valve o ens, whereby the volume of Huid permltte to pass vthe said va'lve into the'mixing chamber'jis 4dlr', i rectly proportional to the velocity pressure in said nozzle; substantially as described.

' In testimony whereof, I have hereunto setv my hand. 'I WILLIAM C; B UELL, JR.

Witnesses: L Gro. B. BLnMINc,

`GEO."H. PANninrl 

